Coverage of the 10 a.m. hearing begins at 9 a.m. on Today. Anchoring that coverage from Washington will be NBC News chief legal correspondent Savannah Guthrie, with Matt Lauer co-anchoring from New York.

Starting at 10 a.m., anchoring duties will be shared among Guthrie, Lester Holt and Chuck Todd from Washington. Holt will stay in Washington to anchor the Nightly News.

Comey is scheduled to testify before the Senate Intelligence Committee about "his role in the development of the Intelligence Community Assessment on Russian interference in the 2016 US elections," said committee chairman Richard Burr (R-N.C.) back when the hearing was announced.

The hearing follows a report in the New York Times that the President had personally asked Comey to back off the investigation of former Trump national security advisor Michael Flynn over his contacts with Russian officials.

Trump subsequently fired Comey, then reportedly told Russian officials Comey was a "nut job" and that his exit had relieved some pressure on the President.

Comey is expected to confirm the contents of the memo at the hearing, though how he characterizes the conversation will be key.